cs: Switch to a stricter way of coding - this might break in a lot of places.

src/Bundle/ChillEventBundle/Entity/Participation.php

@@ -7,6 +7,15 @@
  * the LICENSE file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
+/**
+ * Chill is a software for social workers.
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
 namespace Chill\EventBundle\Entity;
 
 use ArrayAccess;
@@ -194,7 +203,7 @@ class Participation implements ArrayAccess, HasCenterInterface, HasScopeInterfac
     {
         return in_array($offset, [
             'person', 'role', 'status', 'event',
-        ]);
+        ], true);
     }
 
     /**